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Air Purifiers - A Beginner's Guide
Being in the market for an air purifier could leave your head spinning given how many different makes, models and types of air purifiers there are.Do not worry, this short guide will help you learn about filters so you can select the air purifier that is right for your needs.
The first item to cover is that different types of filters are designed to filter different things from the air. Some are designed to pull allergens from the air, others eliminate smoke and odor, while others clear the air of dangerous chemicals such as VOCs from paints, pesticides and chemicals. So, getting an air purifier that is great for filtering chemicals is not the best choice if your true need is to control your allergies.
Here are the filter technologies you will likely see:.
HEPA
HEPA is short for "High Efficiency Particulate Arresting" and this is the type of filter most commonly seen in the marketplace.A paper-thin maze of fibers make up a HEPA filter. As air passes through the filter, particles in the air are grabbed by a fiber and the air that passes through the other side of the filter is clean. When you look at a HEPA filter, you will see that it has many folds in it.This increases the number of exposed fibers and allows as much air as possible to pass through the filter.
In order for a filter to meet the requirements to be a true HEPA filter, 99.97% of all particles 0.3 microns or larger must be removed from the air. IQAir's HyperHEPA filter is designed to capture air particles down to a size of 0.003 microns. IQAir HealthPro air purifiers achieve 99.97% efficiency rate for removing particles that are 100 times smaller than the particle size used to determine filter efficiency.
Primary Use: Allergen and particle control
Activated Carbon
If you have a water filter, you may be familiar with the term "activated carbon" because that is the technology used to filter impurities from water, too. An activated carbon filter adsorbs chemicals from the air (adsorb is something like absorb, but not the same). As air passes through the filter, the effect of Van deer Waals forces cause the chemicals to attach to the filter surface. Over time the surface area of the filter becomes covered with a film of the filtered chemicals.Once this happens, the filter will need to be replaced as it will not be able to capture any additional gases.
The IQAir GC Multigas air purifier uses activated carbon to control the widest spectrum of gaseous compounds, smoke and odors from the air.There are a number of IQAir GC air purifier models and each is designed to control certain gases.
Primary Use: Control airborne chemicals and odors
Ultraviolet Light (UV)
UV filters are used to control viruses, bacteria and mold spores and they work by attacking the DNA of the microorganisms as they pass though the unit. The burst of UV radiation (which is low-intensity at 150 - 300 nanometers) either kills the organism or at least prevents it from being able to reproduce.
Since light radiation is not able to filter particles or gases, these units many times utilize a second technology in order to make them better as an every day air cleaner. Because these filters use light radiation to do the work, the bulbs will have a limited effective life, so changing bulbs periodically is necessary. Please note that just like tanning beds, the bulbs will still emit light even after they no longer emit the radiation needed to actually do what it is designed to do.
Primary Use: Control airborne microorganisms (viruses, bacteria, spores)
Electrostatic
Electrostatic air purifiers work by charging particles as they pass through the filter then collecting the charged particles before the air leaves the unit. In the first stage all particles are charged to one polarity and the second stage plate is charged the opposite polarity. As the charged particles pass by the second stage plate, they get stuck to it electrostatically. Over time the second stage plate will become covered by charged particles and will need to be cleaned off.
This type of technology is generally found in commercial or industrial applications, such as in bars or restaurants.There are residential applications for this technology, but the effective ones are primarily in whole-house systems.
One downside to this technology is that the filtering process may create ozone, which is a dangerous gas.
Primary Use: Removing airborne particulates
As you can see, there are several filter technologies used in air purifiers. Simply knowing what it is you need to clean from your air will allow you to easily narrow down your search, which will help you find the right air purifier.
To learn more about IQAir HealthPro Series air purifiers, please visit IQAirHealthProSeries.com.
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